Electronics > RF, Microwave, Ham Radio

diy 1-1 unun

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p.larner:
i have a 43 mix binocular core,i want to make a 1-1 unun using that and some rg-174 coax,how can i make it,wind etc,thanks in advance.

A.Z.:
are you asking about a 1:1 BalUn/Choke or what ?

if so, just follow this by the letter

https://www.dj0ip.de/rf-cmc-chokes/different-kinds-of-chokes/d2-guanella-choke/

p.larner:
Hi,its for connecting my 300 ohm antenna feeder to the input of an atu-100 atu so i assume its a 1-1 unun i need,i have an ft-240-43 core but  no room in the case for that,but the binocular core would fit,i just am not 100% sure on the winding details ok 73.

A.Z.:

--- Quote from: p.larner on April 04, 2024, 02:39:00 pm ---Hi,its for connecting my 300 ohm antenna feeder to the input of an atu-100 atu so i assume its a 1-1 unun i need,i have an ft-240-43 core but  no room in the case for that,but the binocular core would fit,i just am not 100% sure on the winding details ok 73.

--- End quote ---

Ok, so follow the directions at the link I posted, connect the BalUn to the ATU using some coax (leave it outside the ATU) and connect the other end to the two conductors of your balanced line, all the infos you need are at the link, just focus on it and read carefully

vk4ffab:

--- Quote from: p.larner on April 04, 2024, 10:55:27 am ---i have a 43 mix binocular core,i want to make a 1-1 unun using that and some rg-174 coax,how can i make it,wind etc,thanks in advance.

--- End quote ---

Wind the coax in one hole, out the other, over and over again. Nothing difficult here, a single winding on a binocular core is in one hole out the other in a U shape. If you can get 2 or 3 windings on that core you are good to go. Connector on one end to the transmatch, solder the other end direct to the open line feeder. BOOM, DONE! Probably better to do that on a larger single core or to use 1mm enameled wire on the binocular core. The largest binocular core I have is good to 100w, but the holes are not big enough for enough windings using 174 coax to get decent choking.

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